Ex-cop Henry Shore has been Chief Park Ranger at Crater Lake National Park for eight years and he likes his park and his life the way it’s been. Safe. Tranquil. Predictable. But he’s about to be tested in so many ways. First the earthquakes begin…people begin to go missing…then there’s some mysterious water creature that’s taken up residence in the caves below Crater Lake and it’s not only growing in size, it’s aggressive and cunning…and very hungry.